Effect of Ocean Fluid Changes on Pressure on the Seafloor : Ocean Assimilation Data Analysis on Warm-Core Rings off the Southeastern Coast of Hokkaido, Japan on an Interannual Timescale

Hasegawa, Takuya; Nagano, Akira; Ariyoshi, Keisuke; Miyama, Toru; Matsumoto, Hiroyuki; Iwase, Ryoichi; Wakita, Masahide

Effect of Ocean Fluid Changes on Pressure on the Seafloor : Ocean Assimilation Data Analysis on Warm-Core Rings off the Southeastern Coast of Hokkaido, Japan on an Interannual Timescale

Hasegawa, Takuya; Nagano, Akira; Ariyoshi, Keisuke et al.

Frontiers in Eearth Science, 2021, 9, 600930

Permalink : https://hdl.handle.net/2115/82068

このアイテムのアクセス数:427件（2026-05-15 01:42 集計）

閲覧可能ファイル

ファイル	フォーマット	サイズ	閲覧回数	説明
https://doi.org/10.3389/feart.2021.600930			10

論文情報

ファイル出力 EndNote Basic出力 Mendeley出力

アクセス権	open access
URI	https://hdl.handle.net/2115/82068
タイトル	Effect of Ocean Fluid Changes on Pressure on the Seafloor : Ocean Assimilation Data Analysis on Warm-Core Rings off the Southeastern Coast of Hokkaido, Japan on an Interannual Timescale
著者	Hasegawa, Takuya ; Nagano, Akira ; Ariyoshi, Keisuke ; Miyama, Toru ; Matsumoto, Hiroyuki ; Iwase, Ryoichi ; Wakita, Masahide
e-Rad_Researcher 40466256 著者名 Hasegawa, Takuya
e-Rad_Researcher 40421888 著者名 Nagano, Akira
e-Rad_Researcher 20436075 著者名 Ariyoshi, Keisuke
e-Rad_Researcher 80358770 著者名 Miyama, Toru
e-Rad_Researcher 80360759 著者名 Matsumoto, Hiroyuki
著者名 Iwase, Ryoichi
e-Rad_Researcher 30415989 著者名 Wakita, Masahide
言語	英語
キーワード	sea surface height
	seawater density
	warm-core ring
	oceanic mesoscale eddy
	ocean assimilation data
	ocean isostasy anomaly
	pressure on the seafloor
	steric effect on pressure on the seafloor
発行日	2021-04-30
出版者	Frontiers Media
収録物名	Frontiers in Eearth Science
巻(号)	9
ページ	600930
抄録	The relationship between sea surface height (SSH) and seawater density anomalies, which affects the pressure on the seafloor (PSF) anomalies off the southeastern coast of Hokkaido, Japan, was analyzed using the eddy-resolving spatial resolution ocean assimilation data of the JCOPE2M for the period 2001-2018. On an interannual (i.e., year-to-year) timescale, positive SSH anomalies of nearly 0.1 m appeared off the southeastern coast of Hokkaido, Japan, in 2007, associated with a warm-core ring (WCR), while stronger SSH anomalies (similar to 0.2 m) related to a stronger WCR occurred in 2016. The results show that the effects of such positive SSH anomalies on the PSF are almost canceled out by the effects of negative seawater density anomalies from the seafloor to the sea surface (SEP; steric effect on PSF) due to oceanic baroclinic structures related to the WCRs, especially in offshore regions with bottom depths greater than 1000 m. This means that oceanic isostasy is well established in deep offshore regions, compared with shallow coastal regions. To further verify the strength of the oceanic isostasy, oceanic isostasy anomalies (OIAs), which represent the barotropic component of SSH anomalies, are introduced and analyzed in this study. OIAs are defined as the sum of the SSH anomalies and SEP anomalies. Our results indicate that the effect of oceanic fluid changes due to SSH and seawater density anomalies (i.e., OIAs) on PSF changes cannot be neglected on an interannual timescale, although the amplitudes of the OIAs are nearly 10% of those of the SSH anomalies in the offshore regions. Therefore, to better estimate the interannual-scale PSF anomalies due to crustal deformation related to slow earthquakes including afterslips, long-term slow slip events, or plate convergence, the OIAs should be removed from the PSF anomalies.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
EISSN	2296-6463
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.3389/feart.2021.600930